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TPS54900PW Datasheet(PDF) 1 Page - Texas Instruments |
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TPS54900PW Datasheet(HTML) 1 Page - Texas Instruments |
1 / 16 page TPS54900 SLVS405 – OCTOBER 2001 PROGRAMMABLE FOUR-CHANNEL STEP-DOWN DC/DC CONVERTER (6,4 mm x 5,0 mm) 1 www.ti.com FEATURES D Four Independent 100-mA Channels Programmable Over 4-Wire Serial Port D Converter Regulation Range: 7.5 V to 13.1 V in 400-mV Steps, Plus Unregulated Pass-Through Mode to Shunt VIN to any Output D Internally Compensated PWM Controller and Integrated PMOS Power Switches D Global and Per Channel Status Available Through Serial Port D External Synchronization of PWM With System Clock D Per Channel Current Limit and Global Thermal Shutdown D –40°C to 85°C Ambient Temperature Range APPLICATIONS D ADSL Central Office Line Drivers D Software Line Card Provisioning DESCRIPTION The TPS54900 four-channel step-down converter uses voltage mode PWM control to provide four independently programmable output voltages. Each regulated channel includes a high-side PMOSFET switch with a typical rDS(ON) of 0.8 Ω, which makes it suitable for high efficiency, low current applications. Commands sent to the TPS54900 over the four-wire serial port programs the outputs independently or globally to supply voltages from 7.5 V to 13.1 V in 0.4-V increments. When the input voltage is desired at an output, a bypass mode can be activated which fully enhances the PMOSFET switch and disables the switching circuitry of the selected channel. The TPS54900 is an ideal companion device to power THS7102 ADSL line drivers as a part of the AC5 central office ADSL chipset. With the AC5 chipset controlling the TPS54900 output voltages, significant power savings are realized by reducing the excess supply headroom on a per line basis. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 LX0 LX1 GND SFS SDI EN FB0 FB1 LX3 LX2 VIN SDO SCLK CBS FB3 FB2 TSSOP (PW) PACKAGE (TOP VIEW) 60 70 80 90 100 7 9 11 13 15 Driver Supply Voltage – V 0 20 40 60 80 100 Driver Current Efficiency EFFICIENCY vs DRIVER SUPPLY VOLTAGE PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 2001, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. |
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